You are a biologist trying to investigate the function of YFG (your favorite gene) in mice. You manage to generate mice that are heterozygous knock-outs for YFG (meaning they still have one copy of YFG in their genomes), but their homozygous knock-out offspring are embryonic lethal (meaning they die in utero) due to widespread apoptosis. You conclude that YFG is necessary for viability.
How can you modify your experimental design to study the specific cellular function of YFG?
Select ALL that apply.